What was found
DURING APPROACH, LANDING GEAR WOULD NOT EXTEND AFTER MULTIPLE CYCLES AND SWITCHING SYSTEMS 1 & 2. HYDRAULICS GOOD. USED LANDING GEAR GRAVITY EXTENSION QRH PROCEDURE, GEAR EXTENDED. LANDED UNEVENTFULLY, TOWED IN FROM RUNWAY DUE TO NO NOSE WHEEL STEERING. EMERGENCY DECLARED. AMM: 32-31-12-04, AMM: 32-31-12-06, REMOVED AND REPLACED ELECTROHYDRAULIC VALVE (3GA). PERFORMED INSPECTION/CHECK OF VALVE ALL CHECKS GOOD. NO LEAKS NOTED.